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Investments in Unconsolidated Joint Ventures - Combined Condensed Balance Sheets of Unconsolidated Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Properties, net	$ 2,939,033mac_EquityMethodInvestmentSummarizedFinancialInformationRealEstateInvestmentPropertyNet	$ 2,967,878mac_EquityMethodInvestmentSummarizedFinancialInformationRealEstateInvestmentPropertyNet
Other assets	210,689mac_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets	208,726mac_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
Total assets	3,149,722us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets	3,176,604us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Liabilities and partners' capital:
Mortgage notes payable	1,972,066mac_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt	2,038,379mac_EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt
Other liabilities	188,704mac_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities	195,766mac_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
Company's capital	513,153us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets	489,349us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets
Outside partners' capital	475,799mac_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapitalOtherInterests	453,110mac_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapitalOtherInterests
Total liabilities and partners' capital	3,149,722us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	3,176,604us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity
Investments in unconsolidated joint ventures:
Company's capital	513,153us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets	489,349us-gaap_EquityMethodInvestmentUnderlyingEquityInNetAssets
Basis adjustment	464,776us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	464,826us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
Investments in unconsolidated joint ventures	977,929mac_EquityMethodInvestmentsNet	954,175mac_EquityMethodInvestmentsNet
Assets—Investments in unconsolidated joint ventures	1,006,652us-gaap_EquityMethodInvestments	984,132us-gaap_EquityMethodInvestments
Liabilities—Distributions in excess of investments in unconsolidated joint ventures	$ (28,723)mac_InvestmentsInUnconsolidatedJointVentures	$ (29,957)mac_InvestmentsInUnconsolidatedJointVentures

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